- Charles' spouse, Barbara, has not remarried. Currently, she, and their sons Seamus and Liam (who is writing this), live in Ireland, and have been there for the past two years. (January 2006)
- Buried in Cobh Harbour in the south of Ireland.
- In an interview shortly before his death, he recalled how fans remember him mostly for his role as Norris in John Carpenter's The Thing (1982) and the special make-up effects for the ill-fated geologist.
- Graduated from Temple University, Philadelphia with a Master's of Fine Arts (MFA) degree. (1972)
- Has a brother, Kenneth Hallahan, who is a Roman Catholic Priest in southern New Jersey
- Played as a co-worker for two Vietnam veteran "anti heroes", in "The Thing" (1982) and "The Twilight Zone: The Movie" (1983).
- He was awarded the 1987 Drama Logue Award for Outstanding Performance for "Babbitt: a marriage" at the Mark Taper Forum Theatre in Los Angeles, California.
- He was awarded the 1992 Drama Logue Award for Outstanding Performance for "The Kentucky Circle" at the Mark Taper Forum Theatre in Los Angeles, California.
- He was awarded the 1992 Los Angeles Drama Critics Circle Award for Distinguished Lead Performance for "The Kentucky Cycle" in a Center Theatre Group in association with Intiman Theatre Company at the Mark Taper Forum Theatre in Los Angeles, California.
- He was awarded the 1986 Los Angeles Drama Critics Circle Award for Distinguished Lead Performance for "Rat in the Skull" at the Mark Taper Forum Too Theatre in Los Angeles, California.
- He was awarded the 1986 Drama Logue Award for Outstanding Performance for "Rat in the Skull," at the Mark Taper Too Theatre in Los Angeles, California.
- Played a police officer twice: The Star Chamber (1983) & Dave (1993).
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